I am using the org.json library and found it to be nice and friendly.

Example:

String jsonString = new JSONObject()
                  .put("JSON1", "Hello World!")
                  .put("JSON2", "Hello my World!")
                  .put("JSON3", new JSONObject().put("key1", "value1"))
                  .toString();

System.out.println(jsonString);

OUTPUT:

{"JSON2":"Hello my World!","JSON3":{"key1":"value1"},"JSON1":"Hello World!"}

I believe that you're organizing your data backwards. It seems that you want to use an array of NewsItems, and if so, then your java JSON generation code should look like this:

JSONObject obj = new JSONObject();
JSONArray arr = new JSONArray();

for(int i = 0 ; i< list.size() ; i++)
{
    p = list.get(i);

    obj.put("id", p.getId());
    obj.put("title", p.getTitle());
    obj.put("date". new MyDateFormatter().getStringFromDateDifference(p.getCreationDate()));
    obj.put("txt", getTrimmedText(p.getText()));

    arr.put(obj);

    obj = new JSONObject();
}

Now your JSON string will look something like this:

[{"id": "someId", "title": "someTitle", "date": "dateString", "txt": "someTxt"},
 {"id": "someOtherId", "title": "someOtherTitle", "date": "anotherDateString", "txt": "someOtherTxt"},
 ...]

Assuming that your NewsItem gettors return Strings. The JSONObject method put is overloaded to take primitive types also, so if, e.g. your getId returns an int, then it will be added as a bare JSON int. I'll assume that JSONObject.put(String, Object) calls toString on the value, but I can't verify this.

Now in javascript, you can use such a string directly:

var arr =
    [{"id": "someId", "title": "someTitle", "date": "dateString", "txt": "someTxt"},
     {"id": "someOtherId", "title": "someOtherTitle", "date": "anotherDateString", "txt": "someOtherTxt"}];

for (i = 0; i < arr.length; i++)
    alert(arr[i].title); // should show you an alert box with each first title

org.json.JSONArray may be what you want.

String message;
JSONObject json = new JSONObject();
json.put("name", "student");

JSONArray array = new JSONArray();
JSONObject item = new JSONObject();
item.put("information", "test");
item.put("id", 3);
item.put("name", "course1");
array.put(item);

json.put("course", array);

message = json.toString();

// message
// {"course":[{"id":3,"information":"test","name":"course1"}],"name":"student"}

You will need to use JSONArray and JsonArrayBuilder to map these json arrays.

This is the code you need to use:

    String jsonString = new JSONObject()
        .put("data", new JSONObject()
            .put("nightclub", Json.createArrayBuilder()
                    .add("abcbc")
                    .add("ahdjdjdj")
                    .add("djdjdj").build())
            .put("restaurants", Json.createArrayBuilder()
                    .add("abcbc")
                    .add("ahdjdjdj")
                    .add("djdjdj").build())
            .put("response", "success"))
                    .toString();

Welcome to the wonderful world of \n breaking your parser.

\n specifies a newline character, i'm not sure exactly why it breaks the parser but adding a \ to it will espace the control character.

@Test
public void test() throws JSONException {

        String s = 
        "{\"hours\":[\"1\",\"2\",\"3\",\"4\",\"5\",\"6\",\"7\",\"8\",\"9\",\"10\",\"11\"],\"lessons\":[\"\u05d2\u05d9\u05d0,\u05ea\u05dc\u05de,\u05e2\u05e8\u05d1,\u05e4\u05d9\u05e1,\u05d1\u05d9\u05d5,\n\u05d6\u05d9\u05d5,\u05d5\u05d9\u05d9,\u05dc\u05d5\u05d9,\u05e4\u05d1\u05dc,\u05e8\u05d9\u05d9,\",\"\u05d2\u05d9\u05d0,\u05ea\u05dc\u05de,\u05e2\u05e8\u05d1,\u05e4\u05d9\u05e1,\u05d1\u05d9\u05d5,\n\u05d6\u05d9\u05d5,\u05d5\u05d9\u05d9,\u05dc\u05d5\u05d9,\u05e4\u05d1\u05dc,\u05e8\u05d9\u05d9,\",\"\u05d7\u05e0\\\"\u05d2 \u05d1\u05e0\u05d9\u05dd,\u05d7\u05e0\\\"\u05d2 \u05d1\u05e0\u05d5\u05ea\n\u05d9\u05de\u05e4\u05d5\u05dc\u05e1\u05e7\u05d9 \u05dc,\u05e0\u05d0\u05d5\u05e8 \u05de\u05dc\u05d9\",\"\u05e1\u05e4\u05e8\u05d5\u05ea\n\u05d6\u05d9\u05dc\u05d3\u05de\u05df \u05d0\u05d5\u05e8\u05dc\u05d9\",\"\u05d0\u05e0\u05d2\u05dc\u05d9\u05ea\n\u05d1\u05e9\u05d9 \u05e9\u05d5\u05dc\u05de\u05d9\u05ea\",\"\u05d0\u05e0\u05d2\u05dc\u05d9\u05ea\n\u05d1\u05e9\u05d9 \u05e9\u05d5\u05dc\u05de\u05d9\u05ea\",\"\u05ea\u05e0\\\",\u05e2\u05e8\u05d1,\u05e6\u05e8\u05e4,\u05e7\u05d5\u05dc,\u05d1\u05d9\u05d5,\n\u05e9\u05d7\u05e3,\u05de\u05d6\u05dc,\u05dc\u05e1\u05e7,\u05d8\u05d5\u05e4,\u05dc\u05d5\u05d9,\",\"\u05ea\u05e0\\\",\u05e2\u05e8\u05d1,\u05e6\u05e8\u05e4,\u05e7\u05d5\u05dc,\u05d1\u05d9\u05d5,\n\u05e9\u05d7\u05e3,\u05de\u05d6\u05dc,\u05dc\u05e1\u05e7,\u05d8\u05d5\u05e4,\u05dc\u05d5\u05d9,\",\"\u05e2\u05e8\u05d1,\u05e7\u05d5\u05dc,\u05d1\u05d9\u05d5,\u05d8\u05db\\\",\u05e8\u05d5\u05e1,\n\u05dc\u05d5\u05d9,\u05e7\u05de\u05d7,\u05d1\u05e1\u05d5,\u05d5\u05e7\u05e1,\u05e6\u05d5\u05e8,\",\"\u05e2\u05e8\u05d1\u05d9,\u05e7\u05d5\u05dc\u05e0,\u05d1\u05d9\u05d5\u05d8,\u05d8\u05db\\\"\u05dd\n\u05dc\u05d5\u05d9,\u05d1\u05e1\u05d5\u05df,\u05d5\u05e7\u05e1,\u05e6\u05d5\u05e8\",\"\"]}";
        s= s.replaceAll("\n", "\\n");
        JSONObject json = new JSONObject(s); 
    }

works fine.

Edit: looking at your code you are in luck. Some services sometimes add a crazy character to the start of the feed and it looks like this is what happened here. You just need to trim it from the string.

Example :

s = s.substring(s.indexOf("{"));